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Question: Sample. A study in South Africa focusing on the impact of health insurance identified 1590 children at birth and then sought to conduct follow-up health studies 5 years later. Only 416 of the original group participated in the 5-year follow-up study. This made researchers concerned that the follow-up group might not accurately resemble the total group in terms of health insurance. The table in the next column summarizes the two groups by race and by presence of medical insurance when the child was born. Carefully explain how this study demonstrates Simpson's paradox. (Birth to Ten Study, Medical Research Council, South Africa)
A point estimate for the difference between the mean purchases of the users of the two credit cards is:
compute a one-sample t-test comparing the age of your sample to the age of the general population of college students
The player never misses high, but he can miss to the right of the goal (if he aims to the right) or to the left (if he aims to the left).
The principle of avoiding assigning probabilities of 0 or 1 to any event (except for mathematical certainties) was named Cromwell's rule by the statistician.
What is the probability a person in the study preferred plain bottled water?
The closing price of a company's stock tomorrow can be lower, higher or the same as today's closed. Without any prior information that may affect the price of the stock tomorrow, the probability that it will close higher than today's close is 1/3
Role play. It is 1849 and you live in Southern Illinois. Both the notion of "Manifest Destiny" and a recent gold strike in California have encouraged.
Standard deviation of $1.2 million in 2009. Suppose a sample of 100 major league players was taken. What was the standard error for the sample mean salary?
computed using a Binomial Distribution
Sales volumes are expected to be either 20000 units with 60 percent probability or they are expected to be 25000 units. Price will either be $10 (0.3 probability) or else $15. Margins are expected to be either to be 30 percent or 40 percent of sal..
Assume that 13 % of the population of the U.S. is left-handed. If a random sample of 180 people from the U.S. is chosen, approximate the probability that fewer than 26 are left-handed.
What is the probability that the freshman is enrolled in both English 105 and Mathematics 101? What is the probability that the freshman is enrolled in English 105 but not in Mathematics 101? What is the probability that the freshman is not enrolled ..
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